Seronegative polyarthritis.
D000974:Antibodies, Antinuclear / Q000032:analysis; D001168:Arthritis / Q000276:immunology*; D001172:Arthritis, Rheumatoid / Q000276:immunology; D006801:Humans; D012217:Rheumatoid Factor / Q000032:analysis; D013167:Spondylitis, Ankylosing / Q000276:immunology
D000974:Antibodies, Antinuclear; D012217:Rheumatoid Factor